Minneapolis-Moline 206 Engine Military?

Left Side

Right Side

I've been able to learn a little about this engine. From what I've learned this is not an adjustable compression engine like was orginaly thought. It is supose to have hydrolic lifters for the valves. This engine was probably a military engine and the NTX Jeep's are supose to use this engine. Thanks to those of you who have gave me some information on this engine but if you know more please let me know.
Thanks
Jeremy